Changed "dash" to "hyphen" as we expect a hyphen character here ("-") and dash is usually a "long hyphen" (e.g. "—" or "–") (modelcontextprotocol#1697)

Co-authored-by: Alex.Akimov <[email protected]>

Author: a-akimov

docs/specification/draft/server/tools.mdx

@@ -215,7 +215,7 @@ A tool definition includes:
 - Tool names SHOULD be between 1 and 128 characters in length (inclusive).
 - Tool names SHOULD be considered case-sensitive.
 - The following SHOULD be the only allowed characters: uppercase and lowercase ASCII letters (A-Z, a-z), digits
-  (0-9), underscore (\_), dash (-), and dot (.)
+  (0-9), underscore (\_), hyphen (-), and dot (.)
 - Tool names SHOULD NOT contain spaces, commas, or other special characters.
 - Tool names SHOULD be unique within a server.
 - Example valid tool names: